A couple of relevant issues on github:
https://github.com/fish-shell/fish-shell/issues/1656
https://github.com/fish-shell/fish-shell/issues/159
The problem: can't capture command substitution output with newlines intact
$ set out (seq 5)
> $ echo "$out"
> 1 2 3 4 5
To do it properly, we need to reset IFS to the empty string
$ set oldIFS "$IFS"
> $ set IFS ""
> $ set out (seq 5)
> $ echo "$out"
> 1
> 2
> 3
> 4
> 5
> $ set IFS "$oldIFS"
To do it improperly, append a newline to each list element. You still get
space-separated elements, and you get an extra newline at the end:
$ set out {(seq 5)}\n
> $ echo "$out"
> 1
> 2
> 3
> 4
> 5
> $
On Thu, Mar 26, 2015 at 5:54 AM, Elias Assmann <elias.assm...@gmail.com>
wrote:
> Hi Fishers,
>
> In fish, command substitution returns a list when the command outputs
> multiple lines, like this:
>
> > function foo; echo $argv[1]; end
> > foo (echo a; echo b; echo c)
> a
>
> But what do you do when you need the output as one word? (Where, in
> Other Shells, you might do ‘foo "$(echo a; echo b; echo c)"’.)
>
>
> Here's the problem that leads me to ask this: I wanted to tell
> subversion to ignore all files present in my directory that are not
> already under version control. This command gets me a list of those files:
>
> > alias svnlist "svn st | grep '\?' | tr -s ' ' | cut -d ' ' -f 2"
>
> It outputs one file per line, which is just the format that the
> ‘svn:ignore’ property expects. But this
>
> > svn ps svn:ignore (svnlist) .
>
> fails because the property value must be a single word. On the other
> hand, this
>
> > svn ps svn:ignore (svnlist | tr '\n' ' ') .
>
> as well as this
>
> > set tmp (svnlist); svn ps svn:ignore "$tmp" .
>
> does not work because it puts all the files on one line.
>
>
> In the present case you can use ‘svn propset’s --file option, either
> with standard input
>
> > svnlist | svn ps svn:ignore -F - .
>
> or in combination with ‘psub’. One of these workarounds is likely to
> work in many cases. But still, is there a way to capture the exact
> output of a command?
>
>
> Elias
>
>
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